Update express to the latest version 🚀 (#829)

* chore(package): update express to version 4.17.1

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -54,7 +54,7 @@
     "cross-env": "5.2.0",
     "eslint": "5.16.0",
     "eslint-plugin-flowtype": "3.9.0",
-    "express": "4.17.0",
+    "express": "4.17.1",
     "gulp": "4.0.2",
     "gulp-babel": "8.0.0",
     "gulp-derequire": "2.1.0",